Vertex coordinates of mesh imported from Blender as fbx are all equal to 0,0,0?
I had this issue and solved it by unchecking the Scale Import option.  I think its because the model was too small so when it scales it down, everything is too close to 0.0 and gets rounded.
I imagine you were getting the same thing as most of your values are already 0.1 and then scale it down 100x it becomes 0.0.